Install SyncToy

SyncToy is a nice backup tool from Microsoft that is sadly not supported or even offered for download anymore.
The best download opportunity IMO is from archive.org (https://web.archive.org/web/20190427065841/http://download.microsoft.com/download/6/c/4/6c406239-a648-4e01-833e-2c452deed3b6/SyncToySetupPackage_v21_x64.exe) since this should be a snapshot from the original Microsoft site.

To be able to install SyncToy, the installer asks for a specific .NET version. This version is included in the .NET Framework that can be installed in Windows by

• hitting the Windows Key and typing „Turn Windows features on or off.
• selecting „.NET Framework 3.5 (includes .NET2.0 and 3.0)

Install SyncToy afterwards.

backup Thunderbird profile (still works with Windows 11)

If you want to move your Thunderbird mails from one computer to another, take the following steps:

• on the old Windows 7 or Windows 10 computer go to %APPDATA% and copy the Thunderbird folder (including a Profiles folder and the file profiles.ini) to an external disk drive.
• on the new Windows 7 or Windows 10 computer, go to the folder %APPDATA%\Thunderbird or create it respectively. (That should be something like C:\Users\YOURUSER\AppData\Roaming\Thunderbird)
• copy profiles.ini from your old Thunderbird folder to the new one.
• copy the old Thunderbird folder to a directory of your choice (e.g. C:\Mail\)
• open %APPDATA%\Thunderbird\profiles.ini in an editor and change the path name under Path to match the location of the profile in your Profiles folder.
• When using an absolute path, change isRelative from „1“ to „0“ and use backslashes for the path! For a relative path use slashes.
• example:

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=0
Path=C:\Mail\Thunderbird\Profiles\3yd2397e.default